CN111641111B - Built-in gap arrester - Google Patents
Built-in gap arrester Download PDFInfo
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- CN111641111B CN111641111B CN202010399527.1A CN202010399527A CN111641111B CN 111641111 B CN111641111 B CN 111641111B CN 202010399527 A CN202010399527 A CN 202010399527A CN 111641111 B CN111641111 B CN 111641111B
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- arc extinguishing
- arrester
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 208000025274 Lightning injury Diseases 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/16—Overvoltage arresters using spark gaps having a plurality of gaps arranged in series
- H01T4/20—Arrangements for improving potential distribution
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/16—Resistor networks not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/123—Arrangements for improving potential distribution
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/02—Means for extinguishing arc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/16—Series resistor structurally associated with spark gap
Abstract
The utility model relates to an electrical engineering technical field discloses a built-in clearance arrester. The built-in gap lightning arrester comprises an insulating outer sleeve and a lightning arrester body arranged in the insulating outer sleeve; the arrester body includes resistance piece unit and the vacuum arc extinguishing unit of following the axial in turn and stacking arrangement, the vacuum arc extinguishing unit has the vacuum gap. This disclosed embodiment has optimized arrester electric field distribution through piling up the setting in turn with resistive chip unit and vacuum arc extinguishing unit, cooperates the vacuum clearance of vacuum arc extinguishing unit simultaneously, has strengthened arrester arc extinguishing ability, has improved power frequency afterflow problem.
Description
Technical Field
The utility model relates to an electrical engineering technical field especially relates to a built-in clearance arrester.
Background
Along with the gradual perfection of an electric power system, the radiation area of a power grid is wider and wider, and the terrain, weather and the like traversed by the power transmission line are complex and changeable, so that accidents such as tripping power failure, equipment damage and the like caused by lightning strike on the power transmission line frequently occur, and therefore line lightning protection is a persistent symptom which troubles the stable operation of the power grid and the reliable power supply of users.
The existing lightning protection measures mainly comprise the steps of erecting a lightning conductor, reducing the grounding resistance of a tower, additionally arranging a parallel gap or a line lightning arrester on the tower and the like. The distribution network transmission line has the condition of no lightning conductor wiring, and the newly added lightning conductor is difficult to modify and difficult to implement; the tower grounding transformation is limited by the terrain where the tower is located, and the defects of high construction difficulty, high investment cost, unobvious transformation effect and the like exist; the parallel gap structure can prevent lightning flashover from damaging the external insulation of the insulator, but the flashover characteristic of the parallel gap structure is easily influenced by environmental factors such as icing and the like, and the lightning flashover tripping of a line cannot be prevented.
The line gapless lightning arrester has the defects of power frequency follow current, difficulty in arc extinction, aging of the lightning arrester and the like. The existing arrester with gaps adopts a series external gap structure, and gap discharge is easily affected by icing, rainstorm and other disasters, so that misoperation is caused; the inner gap arrester is easy to lead to the composite outer sleeve to flashover when the electric field distribution is uneven, if the gap in the inner gap arrester is set to be an air gap, the arc extinguishing capability is weak, the power frequency follow current problem is easy to cause, if the gap in the inner gap arrester is set to be a vacuum gap, the impact tolerance voltage between vacuum electrodes is easy to continuously rise due to residual gas molecules, volatile matters and the like, and the problems of low discharging stability, poor repeatability and the like exist.
Disclosure of Invention
To at least partially solve the above technical problem, the present disclosure provides a built-in gap arrestor.
The disclosure provides a built-in gap arrester, which comprises an insulating outer sleeve and an arrester body arranged in the insulating outer sleeve;
the arrester body includes resistance piece unit and the vacuum arc extinguishing unit of following the axial in turn and stacking arrangement, the vacuum arc extinguishing unit has the vacuum gap.
Optionally, the thickness ratio of the resistor sheet unit to the vacuum arc extinguishing unit in the axial direction is 1: 1.
Optionally, the vacuum arc extinguishing unit includes a vacuum arc extinguishing cavity, an upper electrode and a lower electrode;
the upper electrode and the lower electrode are arranged in the vacuum arc extinguishing cavity and are respectively positioned at the upper end and the lower end of the vacuum arc extinguishing cavity in the axial direction, and the vacuum gap is formed between the upper electrode and the lower electrode.
Optionally, the vacuum arc extinguishing unit further includes an electrode belt, the electrode belt is disposed in the vacuum arc extinguishing cavity, in the axial direction, the electrode belt is located at an intermediate position between the upper electrode and the lower electrode, and surrounds the upper electrode and the lower electrode.
Optionally, the resistor disc unit comprises a single disc-shaped zinc oxide resistor disc.
Optionally, the insulating jacket comprises a composite jacket.
Optionally, the gap arrester further includes a plurality of insulating core rods, the insulating core rods surround the arrester body, and the insulating outer sleeve is disposed outside the arrester body and the insulating core rods.
Optionally, the built-in gap arrester further includes an upper crimping fitting and a lower crimping fitting, the upper crimping fitting and the lower crimping fitting are respectively arranged on the insulating outer sleeve at the upper end and the lower end in the axial direction, and are crimped to the insulating core rod.
Optionally, the gap arrester further comprises a metal gasket, a spring piece, a steel cap hardware fitting and a screw hardware fitting;
the metal gasket is connected with the upper end of the lightning arrester body, the spring piece is connected with the metal gasket and the steel cap hardware fitting respectively, and the screw rod hardware fitting is connected with the lower end of the lightning arrester body.
Optionally, the metal gasket comprises a pie-shaped aluminum sheet.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
according to the built-in gap arrester provided by the embodiment of the disclosure, the resistor sheet units and the vacuum arc extinguishing units are alternately stacked, so that the uniformity of the electric field distribution of the arrester is improved, the problem of resistor sheet aging is solved, and flashover is prevented; meanwhile, the vacuum gap of the vacuum arc extinguishing unit is matched, so that the arc extinguishing capability of the lightning arrester is enhanced, and the problems of power frequency follow current and arc ablation on the inner wall of the gap are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic cross-sectional structure diagram of a lightning arrester with built-in gap provided in an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a vacuum arc extinguishing unit provided in an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a vacuum arc extinguishing unit flashover provided by an embodiment of the present disclosure.
Wherein, 1, insulating the outer sleeve; 2. a resistance sheet unit; 3. a vacuum arc extinguishing unit; 4. an insulating core rod; 5. upward crimping hardware; 6. pressing down a hardware fitting; 7. a metal gasket; 8. a spring plate; 9. a steel cap hardware fitting; 10. a screw hardware fitting; 31. a vacuum gap; 32. a vacuum arc extinguishing cavity; 33. an upper electrode; 34. a lower electrode; 35. an electrode belt; 36. an insulating support; 37. and (4) an arc.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic cross-sectional structure diagram of a lightning arrester with built-in gap provided in the embodiment of the present disclosure. The built-in gap arrester is suitable for 10kV power transmission lines. The embodiment of the present disclosure is described by taking an example of a built-in gap arrester suitable for a 10kV transmission line, but the scope of protection of the embodiment of the present disclosure is not limited thereto. As shown in fig. 1, the arrester with built-in gap includes an insulating sheath 1 and an arrester body disposed in the insulating sheath 1;
the arrester body comprises a resistor sheet unit 2 and a vacuum arc extinguishing unit 3 which are alternately and stacked in the axial direction X, and the vacuum arc extinguishing unit 3 has a vacuum gap 31.
In this embodiment, the vacuum arc extinguishing unit 3 with the vacuum gap 31 and the resistor sheet unit 2 are stacked to form a series gap, and the series gap maintains an insulating state during normal operation, so that long-term live operation of the resistor sheet is avoided. When the lightning stroke overvoltage or the operation overvoltage which is allowed by the system is exceeded, the series gap is electrically broken down to form a conductive arc, the impact current enters the ground through the resistor disc, and the voltage limiting characteristic of the resistor disc acts, so that the electrical equipment which is connected with the lightning arrester in parallel is protected. In the duration of the overvoltage phenomenon, the operating voltage always acts on the series gap, and for the conventional series gap, when the overvoltage disappears, the electric arc between the series gaps may not be extinguished therewith, so that the follow current electric arc phenomenon is formed, and the series gap cannot be restored to an insulating state. In the disclosure, the formed series gaps are vacuum gaps, that is, the series gaps are vacuum, ions do not exist or few ions remain, and the path of the arc can be blocked, so that the arc is extinguished when the overvoltage disappears, the arc extinguishing capability of the lightning arrester is enhanced, and the problems of power frequency follow current and arc ablation on the inner walls of the gaps are solved.
In addition, flashover refers to the destructive discharge of a gas or liquid medium along an insulating surface under high voltage. Creeping discharge refers to a discharge phenomenon occurring along the interface between an insulator and air; the flashover is the air breakdown from the creeping discharge to the penetrability. The surface discharge and the electric field distribution on the surface of the solid medium are greatly related, and when the electric field distribution is extremely uneven, flashover is easy to occur. Therefore, the present disclosure improves the uniformity of the electric field distribution of the arrester by alternately arranging the resistive sheet unit 2 and the vacuum arc extinguishing unit 3, thereby preventing the occurrence of flashover and simultaneously improving the problem of resistance sheet aging.
It should be noted that the gap arrestor provided by the embodiment of the present disclosure may include one resistive sheet unit 2 and one vacuum arc extinguishing unit 3, and preferably, to improve the problem of the aging of the resistive sheet, the gap arrestor includes a plurality of resistive sheet units 2 and a plurality of vacuum arc extinguishing units 3, and fig. 1 exemplarily shows four resistive sheet units 2 and four vacuum arc extinguishing units 3. Both ends of the lightning arrester body can be a resistor disc unit 2 or a vacuum arc extinguishing unit 3, and one end of the lightning arrester body can be the resistor disc unit 2 while the other end is the vacuum arc extinguishing unit 3. For example, in fig. 1, the upper end of the arrester body is a vacuum arc extinguishing unit 3, and the lower end is a resistor disc unit 2.
According to the built-in gap arrester provided by the embodiment of the disclosure, the resistor sheet units and the vacuum arc extinguishing units are alternately stacked, so that the uniformity of the electric field distribution of the arrester is improved, the problem of resistor sheet aging is solved, and flashover is prevented; meanwhile, the vacuum gap of the vacuum arc extinguishing unit is matched, so that the arc extinguishing capability of the lightning arrester is enhanced, and the problems of power frequency follow current and arc ablation on the inner wall of the gap are solved.
Based on the above embodiment, the thickness ratio of the resistive sheet unit 2 and the vacuum arc extinguishing unit 3 in the axial direction X may be 1: 1. Therefore, the flashover can be effectively prevented.
As an alternative embodiment of the present disclosure, as shown in fig. 2, the vacuum arc-extinguishing unit 3 includes a vacuum arc-extinguishing chamber 32, an upper electrode 33 and a lower electrode 34; the upper electrode 33 and the lower electrode 34 are disposed in the vacuum arc-extinguishing chamber 32 and located at the upper end and the lower end of the vacuum arc-extinguishing chamber 32 in the axial direction, respectively, and a vacuum gap 31 is formed between the upper electrode 33 and the lower electrode 34.
Further, the vacuum arc extinguishing unit 3 further includes an electrode strip 35, the electrode strip 35 is disposed in the vacuum arc extinguishing chamber 32, and the electrode strip 35 is located at a middle position between the upper electrode 33 and the lower electrode 34 in the axial direction and is disposed around the upper electrode 33 and the lower electrode 34.
In this embodiment, the electrode strip 35 may be a copper thin strip, which is ring-shaped and fixed by the insulating support 36, under the action of lightning current, part of the anode material is generated and moves toward the cathode direction, and the generation path of the arc 37 (see fig. 3) is bound, thereby solving the problem of the electrode breakdown and arc erosion gap inner wall, enhancing the stability of electrode discharge, avoiding the phenomenon that the impact withstand voltage between vacuum electrodes continuously rises due to residual gas molecules, volatile matters and the like, providing support for reliable and effective lightning protection of the lightning arrester, and greatly improving the lightning protection level of the circuit. Further, the arc 37 is led from the upper electrode 33 to the lower electrode 34 via the electrode strips around the upper electrode 33 and the lower electrode 34, and the path of the arc 37 is elongated, so that the arc 7 is more easily extinguished after the overvoltage disappears.
Based on the above embodiment, the resistor disc unit comprises a single disc-shaped zinc oxide resistor disc. The nonlinear characteristic of the zinc oxide resistance card is utilized, the current leakage capacity is high, and the lightning protection capacity of the circuit is improved. Correspondingly, the vacuum arc extinguishing unit 3 is in a pie shape, and the vacuum arc extinguishing unit 3 and the resistance sheet unit 2 are coaxially arranged and have the same diameter (outer diameter).
Optionally, the insulating jacket comprises a composite jacket. Compared with the traditional porcelain-sheathed lightning arrester, the lightning arrester has the advantages of small size, light weight, firm structure, strong pollution resistance, good electrical insulation performance, high dielectric strength, tracking resistance, electric corrosion resistance, heat resistance, cold resistance, aging resistance, explosion resistance, hydrophobicity, sealing performance and the like. The composite outer sleeve can be made of a silicon rubber composite material, and can be an umbrella skirt sleeve shown in figure 1.
As an embodiment of the present disclosure, with continued reference to fig. 1, the lightning arrester with built-in gap further includes a plurality of insulating core rods 4, the insulating core rods 4 are disposed around the lightning arrester body, and the insulating outer sleeve 1 is disposed outside the lightning arrester body and the insulating core rods. Illustratively, the insulating core rod 4 can be a glass fiber rod, eight insulating core rods 4 are arranged around the lightning arrester body at equal intervals, and the diameter of the insulating core rod 4 is 15 mm.
Further, the built-in gap arrester further comprises an upper crimping fitting 5 and a lower crimping fitting 6, wherein the upper crimping fitting 5 and the lower crimping fitting 6 are respectively arranged at the upper end and the lower end of the insulating outer sleeve 1 in the axial direction X and are crimped on the insulating core rod 4. The insulating core rod 4 is fixedly crimped through the upper crimping fitting 5 and the lower crimping fitting 6, and a mechanical supporting effect is achieved.
Further, the built-in gap arrester also comprises a metal gasket 7, a spring piece 8, a steel cap hardware fitting 9 and a screw rod hardware fitting 10; the metal gasket 7 is connected with the upper end of the lightning arrester body, the spring piece 8 is connected with the metal gasket 7 and the steel cap hardware fitting 9 respectively, and the screw rod hardware fitting 10 is connected with the lower end of the lightning arrester body. Wherein, the metal gasket 7 can comprise a pie-shaped aluminum sheet, and the thickness ratio of the metal gasket 7 to the vacuum arc extinguishing unit 3 can be 1: 5; the diameter of the screw portion of the screw metal 10 may be 20 mm. Therefore, the existing lightning arrester can be directly replaced by only tying the conducting wires at the steel cap hardware fitting 9 and fixing the screw rod hardware fitting 10 at the cross arm of the tower, the installation is simple and easy, and the problem of lightning arrester installation is solved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A built-in gap arrester is characterized by comprising an insulating outer sleeve and an arrester body arranged in the insulating outer sleeve;
the lightning arrester comprises a lightning arrester body and is characterized in that the lightning arrester body comprises a resistor disc unit and a vacuum arc extinguishing unit which are alternately stacked on the axial direction, the vacuum arc extinguishing unit is provided with a vacuum gap, and the resistor disc unit comprises a single disc-shaped zinc oxide resistor disc.
2. The built-in gap arrestor of claim 1, wherein the thickness ratio of the resistive sheet unit and the vacuum quenching unit in the axial direction is 1: 1.
3. The internal gap arrester of claim 1, wherein the vacuum arc extinguishing unit includes a vacuum arc extinguishing chamber, an upper electrode, and a lower electrode;
the upper electrode and the lower electrode are arranged in the vacuum arc extinguishing cavity and are respectively positioned at the upper end and the lower end of the vacuum arc extinguishing cavity in the axial direction, and the vacuum gap is formed between the upper electrode and the lower electrode.
4. The internal gap arrester as claimed in claim 3, wherein the vacuum arc extinguishing unit further comprises an electrode belt disposed in the vacuum arc extinguishing chamber at a position intermediate between and surrounding the upper electrode and the lower electrode in the axial direction.
5. The internal gap arrester of claim 1 wherein the insulating outer jacket comprises a composite outer jacket.
6. The internal gap arrestor of claim 1 further comprising a plurality of insulating mandrels arranged around the arrestor body and an insulating jacket disposed outside of the arrestor body and the insulating mandrels.
7. The internal gap arrester of claim 6 further comprising an upper crimping fitting and a lower crimping fitting, the upper crimping fitting and the lower crimping fitting being respectively disposed at an upper end and a lower end of the insulating sheath in the axial direction and being crimped to the insulating core rod.
8. The internal gap arrestor of claim 1, further comprising a metal shim, a spring plate, a steel cap hardware, and a screw hardware;
the metal gasket is connected with the upper end of the lightning arrester body, the spring piece is connected with the metal gasket and the steel cap hardware fitting respectively, and the screw rod hardware fitting is connected with the lower end of the lightning arrester body.
9. The internal gap arrester of claim 8 wherein the metal shim comprises a pie-shaped sheet of aluminum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399527.1A CN111641111B (en) | 2020-05-12 | 2020-05-12 | Built-in gap arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010399527.1A CN111641111B (en) | 2020-05-12 | 2020-05-12 | Built-in gap arrester |
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| Publication Number | Publication Date |
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| CN111641111A CN111641111A (en) | 2020-09-08 |
| CN111641111B true CN111641111B (en) | 2021-11-16 |
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| CN202010399527.1A Active CN111641111B (en) | 2020-05-12 | 2020-05-12 | Built-in gap arrester |
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| CN115275786A (en) * | 2022-07-06 | 2022-11-01 | 厦门赛尔特电子有限公司 | Multi-gap lightning protection device with pilot trigger electrode |
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| CN104779522B (en) * | 2015-04-08 | 2017-09-15 | 国家电网公司 | A kind of thunder and lightning smoothing device with insulator function |
| CN207282236U (en) * | 2017-07-21 | 2018-04-27 | 国网湖南省电力公司 | A kind of anti-thunder insulator |
| CN207719588U (en) * | 2018-01-15 | 2018-08-10 | 王雅娟 | A kind of partition ball disturbance formula multi-chamber arc extinguishing lightning protection device |
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